Electrical switch.



G. AALBORGr.v

ELECTRICAL SWITCH.

APPLICATION nun no. a. 1907.

Patented Aug. 19, 1913.

4 sums-sum 1.

.mnm v WITNESSES O. AALBORG.

ELECTRICAL SWITCH.

APPLICATION FILED DEC 6, 1907.

Patented Aug. 19, 1913;

4 SHEETS-SHEET Z.

TNVENTOR WITNESSES:

ATTORNB WSW.

I c. AALBORG.

ELECTRICAL SWITCH.

APPLICATION FILED DEC. 6, 1907,

Patented Aug. 19, 1913.

4 SHEETS-SHEET 3.

WITNESSES: "*{VENTOR iATTCRNEY Maw G. AALBORG.

ELECTRICAL SWITCH.

APPLICATION I'ILED no. 6, 1907.

1,070,935. I Patented Aug. 19, 1913.

4 SHEETS-SEEBT 4.

WITNESSES: g

"nnrrsvn STATES Parana ons-ion. I

CHRISTIAN AALBOR-G, OI WILKI'NSBURG, PENNSYLVANIA, ASSIGNGR, BY M E SNEASSIGNMENTS, T WESTINGHOUSE ELECTRIC & MANUFACTURING. CQIEPANY, EASTPITTSBURGH, PENNSYLVANIA, A CORPORATlON OF PEI?NSYLVAN15L.

EI ECTRICAL SWITCH.

Specification of Letters Patent.

Patented Aug. 19, le s.

Application led December 6,1901. Serial K0. 405,406.

i is a specification.

My invention relates to manually operated electrical switches, andit-Jha-s for its.

capacities have usually been provided with laminated termmal'rnembers toinsure good electrical contact between the engaging parts, but suchdevices have been structurallycomphcatcd and expensive to manu- 4facture.

In order to" simplify the structure and reduce the cost of manufactureof switches, I' employ solid contact members, and, in order to obtainrelatively high current-carv rying capacities,,l cause very high pressures to be resiliently applied to' the said contact members when theswitches are closed.

My. invention is illustrated in the accompanying drawings, Figure 1 ofwhich is a 'view, in SKQ elevatiomot a switch constructed 1n accordancetherewith, and in closed position. ig. '2 is a view, inside elevation,of the switch of Fig. 1, in open position. Fig.3 is a view, in frontelevation, of the switch of Figs. 1. and2. Fig. 4 is a sectional view,partially in side elevation.

Fig. 5 is a view, in front elevation, of a modified form of the switch.,F1g. 6 is sectional view on the line VIVI of Fig.

,Stationary terminal members 1 and 2 of the switch are secured to thefront face of a suitable supp. ting panel 3 by meansot stationaryterminal member 2 by means of a pin 7, is a ivehl'ied arm 8 having acontact face 9 adapted to engage a corresponding face 16 upon theterminal member 23am! from thepin 26 provided, at its upper free end,with .1, slightly rounded detachable contact piece 11 adapted to engagea similarly shaped stationary cont-act piece 12 with which the terminalmember 1 is provided. -The opening in the lower end of the arm 8, inwhich the pivot pin is located, is of somewhat larger diameter than thepivot pin in order that a loose pivotal support fcr the arm may beprovided which will not interfere with free and perfect.engagementbetween the contact faces 9 and 10, it being'intended thatcurrent shall pass from the arm 8 to the terminal member 2 through thetontact faces 9 and 10 rather than through the pivotal support for thearm. The arm 3 is operated. y means of a lever 13 pivotally connectedthereto by means of a pin 14 surrounding which is a helical torsionspring 15 that tends to effect relative rotation of the arm and thelever 13 about the pivot pin 14 to open the switch. The operating lever13 has an arm 17 that projects at an angle of nearly 90 from-the bodyportion of the lever and the outer end of which is movably seated in aguide-block 18, a strong helical. compression spring 20 being-interposedbetween said. block and a shoulder 19 upon the body portion of thelever. The guide-block 18 is pivotally connected to the outer ends oftwo links 22 by means of a pin 21 which also extends through a slot inthe end of the arm 17 of the lever, said links being disposed upon oposite sides of the arm 8 and their inner and; being pivot ally securedto an extension 23 of the terminal member 2. I I

The switch is retained infclose'd position by means'o'fi'a ni ger- 24that'is pivotally mounted upon the pm 7 and ispro'vided, at its freeend, with a ho'ok that is' adapted to engage a pin 26 carried by theoperating lever 13. Thatriggcr 24 may be operated by" a handle 27 todis'eng'ageit from the pin 26,'in order to permit the switch to open.-The trigger may also be disengaged y a dog 28, that is mounted upon ashaft 29 and may be operated, either manually or automatically, upon theoccurrence of predetermined conditions, by any suitable means (notshown).

In order to close the switch, the operating lever 13 is moved from theposition shown in Fig. 2 toward the position shown.

in Fig. 1, whereupon the arm 8 will be tively free adjustment of thestationary'and movable engaging partsbeing permit-ted by reason of theloose pivotal support for the arm 8. Further movement of the operatinglever 13 causes the arm 17 thereof'to slide in the guide-block 18 andeffect compression of thespring 20, the pressure-exerted by. said springbeing applied to the engaging contact'faces of the switch, and, when theswitch is completely closed, this pressure is of such degree that theresistanceto :the passage of current between the engaging members of theswitch is materially reduced and the switch is thereby provided with arelatively high current-carrying capacity.

When the switch is completely closed, the trigger 24 engages the pin 26carried by the operating lever 13 and retains the-lever in the positionshown in Fig. 1. In order to prevent injury to the trigger 24 bymovement of the operating lever 13 beyond the position shown in Fig. 1 alug 30 is provided upon the inner side of the operating'lever thatengages the arm 8 in the bottom of the channel between the webbed sidesthereof.

In thGSWitCli of Figs. 1, 9, and 3 the arm 17 of the operating leverprojects outwardly away from the face of the panel 3, but in the switchof Figs. 4 and 5 an operating le ver.32 is providedwitli an arm 33 thatextends'inwardly toward the panel upon which the switch is mounted,'theoperating lever, in this instance. being pivotally connected,

by a pin 34-, to the outer ends-of links the inner ends of which arepivotally connected to an extension 36 of a. stationary contact terminal37. The arm 33 of the operating lever operates in a guide-block 38 whichis pivotally connected to contact-carrying arm 39 and between which anda seat 40 upon the' operating lever, a spring 41 is interposed, saidspring being for the purpose of causing a. very high pressure to beexerted between the engaging contact terminals of the switch. helicalspring 42 surrounds the pivot pin 43 whereby the guide-block 38 isconnected to contact-carrying arm 39 and serves, as does the spring 15of the switch of Figs. 1, 2. and 3,-to cause the initial opening move--meat of. the switch when the operating lever is released. The switch ofFigs. 4, 5 and (i differs from that of Figs. 1, 2, and '3 in itsstructural details, but its mode of'operation. is substantially the sameand it serves to illustrate one of the many structural modilicationsthat ma be made within the spirit .and scope ol my invention.

I claim as my invention: 1. in an electric switch, the combination withstationary terminal members, and :1

loosely pivoted a rm carryingsolid iloikl'tfsilieiitcontact memberswhi'ch; are adapted to engage the respective stationary I ierni'iiialmembers, of a lever tor moving said arm to circuit-closing position anda spring which is compressed by said lever and acts ipon said arm atapoint between said contact members;

2. An electric switch comprising a loosely pivoted contact-carrying arm.an operating lever pivotally connected thereto. a guide block on thesaid lever, a spring interposed between the guide-block and a seat uponthe lever, and an arm pivotally connected at one end to a stationarymember and attlie other end to tlIE-gllld-blOCk.

3. An electric switch comprising a loosely pivoted contact-carrying arm.an operating lever pivotally connected thereto. a guide block on thesaid lever, a spring interposed between the guide-block and a shoulderupon the'lever, an arm pivotally connected at one end to a stationarymember and atthe other end to the guide-blocln means for retaining theswitch in closed position, and a spring for causing the initial openingof the switchwhen released by the said retaining means. 4. An electricswitch comprising a loosely pivoted contact-carrying arm. an operatinglever therefor, an arm with which the operating lever has a slidingpivotal connection, and resilient means interposed between a seat uponthe operating lever and the said sliding pivotal connection.

5; In an electric switch, the combination with a contact-carryingarm,and toggle lever operating mechanism therefor comprising a slidingpivotal connection between its members, of resilient means interposedbetween the said sliding pivotal connection and the operating lever.

(t-In an electric switch, the combination with a contact-carrying arm,toggle lever operating mechanism therefor comprising a sliding pivotalco inection between its mem-- bers, and resilient means interposedbetween the said sliding pivotal connection and the" operating lever, ofmeans for retaining the switch in closed position, and. resilient meansfor effecting an initial opening movement of the switch when releasedby-the said retaininf means. I

1'. An electric switch comprisinga contactcari'ying-arm, an operatinglever pivotally connected thereto, a statioiiarily'pivoted link alsopivoi ally connected to the operating lever, means for permittingadjustment of the distance. between the pivotal cpnnections of theoperating lever to the contact-carrying arm and to the link, andresilient means nor-- mally tending to lengthen thesaid distance.

8. An electric switch comprising a contactcarrying arm, an ope :it-iiiglever pivotally connected thereto, a stationarily pivoted link alsopivotally,conected to the said operating lever, a. giiide-blocl upon theoperating lever forming a part of one of the pivotal connections totheoperating lever, and resilient means interposed betweeh the guideblockand a seat upon the operating lever.

9. An electric switch comprising a loosely pivoted contact-carrying arm,an operating lever pivotally connected thereto, a, stationarily pivotedarm also pivotally connected to the operating lever, a, guide-blockforming a part of one of the pivotal connections of the operating lever,and a compression spring firrounding the said lever and interposedetween a seat thereon and the said guide-block. c

In testimony whereof, I have hereunto subcribed my name this 26th day ofNov., 190

CHRISTIAN AALBORG.

Witnesses: t

H. C. SOULE, BIRNEY HINES.

Copies of this patent my be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

